<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-col :span="6">
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表 -->
      <el-table :data="roleList" border stripe>
        <el-table-column type="expand">
          <template slot-scope="scop">
            <el-row
              v-for="(item1, i1) in scop.row.children"
              :key="item1.id"
              class="level-1-row vcenter"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="rmRightById(scop.row, item1.id)">
                  {{ item1.authName }}
                </el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级/三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环 嵌套渲染二级权限 -->
                <el-row
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                  class="level-2-row vcenter"
                >
                  <el-col :span="5">
                    <el-tag
                      type="success"
                      closable
                      @close="rmRightById(scop.row, item2.id)"
                    >
                      {{ item2.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="19">
                    <el-tag
                      type="warning"
                      v-for="(item3, i3) in item2.children"
                      :key="item3.id"
                      closable
                      @close="rmRightById(scop.row, item3.id)"
                    >
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{ scop.row }}</pre> -->
          </template>
        </el-table-column>
        <el-table-column type="index" label="序号" width="50px" align="center" ></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scop">
            <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
            <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
            <el-button type="warning" size="mini" icon="el-icon-setting" 
              @click="showSetRightDialog(scop.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog title="分配权限" :visible.sync="dialogVisible" 
      width="50%" @close="dialogClosed">
      <!-- 树形控件 -->
      <el-tree  
        ref="treeRef"
        :data="rightList" 
        :props="treeProps" 
        :default-checked-keys="defkeys"
        node-key="id" 
        default-expand-all show-checkbox>
      </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      roleId: '',           // 当前即将分配权限的角色 id
      roleList: [],
      dialogVisible:false,  // 分配权限对话框显示 flag
      rightList: [],        // 树形控件属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点 ID 值数组
      defkeys: []
    };
  },
  created() {
    this.getRoleList();
  },
  methods: {
    async getRoleList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取角色列表失败");
      }
      this.roleList = res.data;
    },
    async rmRightById(role, rightId) {

      // 确认框
      const confirmResult = await this.$confirm(
        "此操作将永久用户权限, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);

      if (confirmResult !== "confirm") {
        return this.$message.info("取消了删除");
      }
      // 发送删除请求
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      );
      if (res.meta.status !== 200) {
        return this.$http.message.error("删除权限失败");
      }
      role.children = res.data;
    },
    // 显示分配权限对话框
    async showSetRightDialog(role){
      this.roleId = role.id;
      // 获取所有权限数据并展示
      const {data:res} = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error("获取权限信息失败")
      }
      this.rightList = res.data;
     
      // 递归获取三级节点的 id

      this.getLeafKeys(role, this.defkeys)

      // show dialog
      this.dialogVisible = true;
    },
    // 关闭对话框
    dialogClosed(){
            this.defkeys = [];
    },
    // 确定修改角色权限
    async allotRights(){
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',');
      const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,
                        {rids: idStr });

      if (res.meta.status !== 200){
        return this.$message.error("分配权限失败")
      }                        
      this.$message.success("分配权限成功");
      this.getRoleList();
      this.dialogVisible = false;

    },
    // 通过递归的形式，获取角色下所有三级权限的 id ，并保存到 defkeys 数组中
    getLeafKeys(node, arr){
      if (!node.children){
        return arr.push(node.id);
      } 

      node.children.forEach(item => {
        this.getLeafKeys(item, arr);
      })
    }
  },
};
</script>

<style scoped>
.el-tag {
  margin: 7px;
}

.level-1-row {
  border-bottom: 1px solid #eee;
}

.level-1-row:first-child {
  border-top: 1px solid #eee;
}

.level-2-row:not(:first-child) {
  border-top: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
